Mounting; Trip Device; Model N U M Ber - GE AKR-30 Series Maintenance Manual

SECTION 2-General Description (Cont.)
2 .4 MOUNTI NG
Type AKA breakers are designed for either drawout or
stationary mounting. Drawout breakers (See Fig.
equi pped with features which make them easy to instal l in
or withdraw from their associated switchgear equipment.
These features are a racking mechanism (which facilitates
i nserting and withdrawing the breaker u nit) and primary
and control power d isconnects which connect and part
automatically. I nterlocking devices are included.
Stationary breakers are designed to be mounted on a
framework or panel, with mechanical fasteners being used
to secure the breaker frame and make power connections.
If control power connections are needed , a suitable termi­
nal board is supplied.
The mo unting type is identified by the second middle
d igit in the breaker's nameplate designation as follows:
�
AKA-5 ( 0
Mounting type code letter per Table 2
TAB L E MOUNTING TYPE CODES
2
Code
Drawout
Letter
AKD-5
A
AKD-6
B
Substructure
D
A K D-8
Substructure
s --
FIG. 5 - CERAMIC A R C CHUTES
8
4)
Breaker Type
Stationary
-
-
-
-
X
.
-
-
2.5

TRIP DEVICE

There are several types of solid-state, direct-acti n g , self­
are powered trip d evice system s associated with AKA
breakers. These systems are for AC applications only.
For DC appl ications an electro-mechanical system is
available.
The trip device system is identified by the first middle
d igit in the breaker nameplate designation as fol lows :
Trip device code nu mber per Table 3
TABLE
CODE N U MBER
2
3
4
5
6
7
9
1
For Power Sensor devices. See publications G EK-7309 and
G EK-7301 for detailed servicing procedures.
2.6 MODEL N U M B E R
Type AKA breakers (see Table 2 ) exist a s either no model
nu mber or "- 1 " versions. For example AKA-5A-30H or
AKA-5A-30H- 1 .
The difference between these models is their arc chute
construction. The arc chutes in the no model number break­
ers have a two piece porcel ai n frame and use 2 arc chute
retainers, s ee Fig. 5. The
piece molded polyester glass frame and 1 arc chute re­
tainer, see Fig.
6.
All AKAT50H b reakers use only molded arc chutes.
FIG. 6 - MOLDED A R C C H U TES
3
TRIP DEVICE CODES
TRIP DEVICE APPLICATION
EC
Power Sensor1
ECS
SST
MicroVersaTrip
RMS-9
MVT-PLUS or
MVT-P M
�
breaker arc chutes have a one
"- 1 "
DC
AC
AC
AC
AC
AC
AC